Building block



FIG. 1 is a top perspective view of the building block of the presentinvention.

FIG. 2 is a bottom perspective view of the building block shown in FIG.1.

FIG. 3 is a top plan view of the building block shown in FIG. 1.

FIG. 4 is a bottom plan view of the building block shown in FIG. 1; and,

FIG. 5 is a front plan view of the building block in FIG. 1, with rear,left side, and right side plan views being identical.

CLAIM The ornamental design for a building block, as shown anddescribed.